Created attachment 17706[details]
limit to 5 connections globally
The problem is that there's no way to limit curl to a specific number of connections.
This patch solves the problem.
However, we need to work more on that, because the limitation is globally and not per domain.
I suggest to land this patch which is useful for other purposes (for example working on wysiwyg, which are really heavy if the issue remains).

Created attachment 17713[details]
fix curl
I tested the patch by browsing several websites that before had this problem due to bad cURL management.
The new patch is complete of ChangeLog. I also added a FIXME to create a separate stack of jobs per domain.

Created attachment 17799[details]
do not crash on job cancel
The previous patch crashed when a job was canceled. This one instead has the same behavior of the original code.
Notice how using the queue most of the code in the manager has been collapsed and therefore cleaned.
Still missing a separate stack of connections per domain, but this is another bug yet.